Javascript中的构造函数不起作用答案

【问题标题】：Constructor function in Javascript isn't workingJavascript中的构造函数不起作用
【发布时间】：2015-05-08 14:48:12
【问题描述】：

我需要提示 5 个属性，然后获取测试分数并获取测试 1、2 和 3 的平均值，然后显示名称和平均值。我无法显示或运行该功能。我的代码有什么问题？

function Student(_firstName, _lastName, _t1, _t2, _t2){

    this.firstName = _firstName ;
    this.lastName = _lastName ;
    this.test1 = _t1 ;
    this.test2 = _t2 ;
    this.test3 = _t3 ;

    this.fullName = function() { return this.firstName + " " + this.lastName } ;

    this.calcAverage = function() { return (this.test1 + this.test2 + this.test3) / 3 } ;

}

var name1 = prompt("Enter the first name:") ;
var name2 = prompt("Enter the last name:") ;
var te1 = parseInt(prompt("Enter the first test score:")) ;
var te2 = parseInt(prompt("Enter the second test score:")) ;
var te3 = parseInt(prompt("Enter the third test score:")) ;

var person = new Student(name1, name2, te1, te2, te3) ;

document.write(+name1+ " " +name2+ " " + person.calcAverage() +) ;

【问题讨论】：

这是做什么的？您是否在控制台中遇到任何错误？
你有很多错误。参数名称是双精度的，document.write 有不必要的“+”号。

标签： javascript function prompt function-constructor

【解决方案1】：

修正你的错别字：

function Student(_firstName, _lastName, _t1, _t2, _t3) {
                                                   ^^ _t3, not _t2

document.write(+ name1 + " " + name2 + " " + person.calcAverage() +);
               ^^ remove +                                        ^^ remove +

DEMO

【讨论】：

【解决方案2】：

工作代码...

function Student(_firstName, _lastName, _t1, _t2, _t3) {

    this.firstName = _firstName;
    this.lastName = _lastName;
    this.test1 = _t1;
    this.test2 = _t2;
    this.test3 = _t3;

    this.fullName = function () {
        return this.firstName + " " + this.lastName
    };

    this.calcAverage = function () {
        return (this.test1 + this.test2 + this.test3) / 3;
    };

}

var name1 = prompt("Enter the first name:");
var name2 = prompt("Enter the last name:");
var te1 = parseInt(prompt("Enter the first test score:"));
var te2 = parseInt(prompt("Enter the second test score:"));
var te3 = parseInt(prompt("Enter the third test score:"));

var person = new Student(name1, name2, te1, te2, te3);

document.write(+name1 + " " + name2 + " " + person.calcAverage());

【讨论】：